The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
We experimentally demonstrate an arbitrary optical higher order QAM generation using single stage nonlinear element and Kerr frequency comb. We successfully generated 80-Gbit/s 16-QAM and 120Gbit/s 64-QAM at EVM of 6.5% and 5.5% by multiplexing two and three 40-Gbit/s QPSK signals, respectively.
We experimentally demonstrate selective up-conversion of either TM00 or TM01 mode of a 1540 nm single-photon signal into TM01 mode at 775 nm with >70% efficiency, better than −10 dB crosstalk, and >102 signal-to-noise-photon ratio.
A tunable all-optical inter-channel interference mitigation method is proposed for an overlapped channel system that avoids the need for multi-channel detection. We experimentally demonstrate the system performance improvement for 16QAM and QPSK overlapped channels for both 20/25 Gbaud data and under different channel spacing conditions.
A tunable optical channel slicing and stitching scheme is experimentally demonstrated in QPSK/16QAM systems. Its application to dynamic bandwidth allocation in WDM channels brings >6dB OSNR improvement at 1e-3 BER comparing to direct channel insertion.
We experimentally demonstrate tunable all-optical simultaneous de-aggregation of multiple wavelength 16-QAM channels into two 4-PAM channels using a single stage nonlinear element. Tunability of the proposed approach over modulation format and bitrate is shown by de-aggregation of multiple channels for 10/15-Gbaud QPSK signals into two BPSK signals.
Using a PPLN waveguide, we selectively up-convert either TM00 or TM01 mode, or any of their superpositions from 1540 nm into TM01 mode at 775 nm, with >70% internal efficiency and better than –16-dB crosstalk.
We experimentally demonstrate a tunable simultaneous ROADM with crosstalk reduction using optical nonlinear elements in spectrally overlapped 20–25 Gbaud QPSK WDM channels. OSNR gain of 5 dB shows the effectiveness of the approach.
We experimentally de-aggregate the 16-QAM signal (EVM 6.9%) onto two 4-PAM signals (EVM 8.5%). Tunability of the approach over modulation format and bit rate is also shown by de-aggregating QPSK signals at two different baud rates.
An optical inter-channel interference mitigation approach for wavelength-overlapped channels with combinations of different baud rates and pulse shapes is experimentally demonstrated. The robustness of this approach is verified by OSNR improvements under distinct system configurations.
We demonstrate an optical multiplexing and transmission of QPSK-to-16QAM channels over 100 km using wave mixing for aggregation and noise mitigation. For the input signals with phase noise of ∼50, 35 degree and 300 MHz noise bandwidth, the OSNR penalty of ∼1dB is obtained at BER 10–3 for aggregated 20 Gbaud 16QAM signal compared to the case of having no phase noise in input signals.
We experimentally characterize the spurious-free dynamic range performance of a χ2-Based PPLN waveguide by measuring the distortion on a microwave photonic link of two RF tones around 9.9GHz and characterizing the SFDR of a generated idler in a PPLN waveguide
We generate offset-free gigahertz frequency combs tunable from 2.75 to 3.8 μm by using PPLN waveguides for 30-dB-amplification of a supercontinuum generated in a Si3N4 waveguide by the same Yb:CALGO-laser that pumps the OPA process.
A reconfigurable optical inter-channel interference compensation method without channel spacing estimation and relative time delay calibration is proposed for a high density multi-carrier transmission system. Experiments demonstrate the effectiveness for both 20/25-Gbaud dual-carrier QPSK systems with different channel spacing conditions.
We experimentally demonstrate a tunable optical delay system that deploys dispersion, wavelength conversion In HNLF and multicasting in PPLN assisted with frequency comb lines pumping which offers discrete simultaneous access to the delayed signal.
We experimentally demonstrate a tunable homodyne receiver on polarization multiplexed QPSK signals. PPLN waveguides inside the polarization diversity loops are used to frequency/phase lock the signals with the LO. Open eye diagrams with BER measurements are shown.
We experimentally demonstrate simultaneous phase noise suppression and automatically locked tunable homodyne reception for 20-Gbaud QPSK signal. The phase noise deviation can be reduced by a factor of ∼3. Open I/Q eyes are obtained after the noise mitigation.
We experimentally demonstrate a tunable homodyne receiver on multiple-wavelength QPSK and 16-QAM channels at 20/30 Gbaud. A single PPLN waveguide is used to frequency/phase lock the signals with their tones. Open eye diagrams with BER measurements are shown.
We demonstrate homodyne detection for multiple channels using nonlinear optical signal processing to automatically lock a single “local” pump laser to these data channels simultaneously and perform experimental demonstration with two 20-Gbaud BPSK channels.
We experimentally demonstrate tunable phase-noise mitigation and automatic frequency/phase locking to a “local” pump laser for a 20–32 Gbaud QPSK homodyne receiver using nonlinear optical signal processing. For the input noisy signal, open eye-diagrams are obtained for in-phase and quadrature components and ∼2 dB OSNR gain is achieved at BER 10−3.
We propose an all-optical regeneration consisting of a phase quantizer based on delay and summation of higher harmonics and an optical amplitude squeezer. We experimentally demonstrate phase noise reduction of 40% and OSNR-gain of 3dB at BER 10−3 for 30-Gbaud QPSK signals.
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.